/Engine/Source/Runtime/Engine/Public/AnimationRuntime.h
Mirror (swap) curves with the specified MirrorDataTable. Partial mirroring is supported, and curves with two entries (Right->Left and Left->Right) will be swapped while curves with a single entry will be overwritten
static void MirrorCurves ( [FBlendedCurve](API\Runtime\Engine\Animation\FBlendedCurve) & Curves, const [UMirrorDataTable](API\Runtime\Engine\Animation\UMirrorDataTable) & MirrorDataTable )